I had to manually put the 'Filters' Folder in the Plugins Folder in Photoshop CS6 Extended as the installation did not install it in CS6. Neutralhazer works fine after it has been registered, but, every now and again Photoshop trashes the Filters folder and I have to manually copy it back again. Is this a known problem?

You can try to move Neutralhazer folder to another location in your system (ex: c:\Program Files\Kolor\Neutralhazer 1.0).

Then go to preferences menu in Photoshop and select Plug-ins. Enable the Additional Plug-ins Folder option, then click Choose. Please navigate to the new Neutralhazer plug-in location. Save the settings and restart Photoshop. Once Photoshop opens, go to your Filter menu and see if this works.

Hi, I put the Kolor folder in Applications (Mac) and selected the folder in Photoshop Preferences Plugins. When I reopened Photoshop Kolor/Neutralhazer was in Filters. but when I selected it I was told 'Could not complete the Neutralhazer command because the file was not found.'

Indeed Neutralhazer cannot work in that way on MacOS. As you didn't mention your platform, I guessed you were using Windows. On MacOS, installer should have found Photoshop CS6. Please check if /Users/<YOUR_USERNAME>/Library/Preferences/ directory contains a file named "Adobe Photoshop CS6 Paths" and please tell me what it contains (open with textedit app).